Scientists’ warning to humanity on the freshwater biodiversity crisis

AMBIO, Journal Year: 2020, Volume and Issue: 50(1), P. 85 - 94

Published: Feb. 10, 2020

Language: Английский

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Hydropower dams of the Mekong River basin: A review of their hydrological impacts

Journal of Hydrology, Journal Year: 2018, Volume and Issue: 568, P. 285 - 300

Published: Oct. 22, 2018

Language: Английский

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The global decline of freshwater megafauna

Global Change Biology, Journal Year: 2019, Volume and Issue: 25(11), P. 3883 - 3892

Published: Aug. 8, 2019

Freshwater ecosystems are among the most diverse and dynamic on Earth. At same time, they threatened but remain underrepresented in biodiversity research conservation efforts. The rate of decline vertebrate populations is much higher freshwaters than terrestrial or marine realms. megafauna (i.e., freshwater animals that can reach a body mass ≥30 kg) intrinsically prone to extinction due their large size, complex habitat requirements slow life-history strategies such as long life span late maturity. However, population trends distribution changes megafauna, at continental global scales, unclear. In present study, we compiled data 126 species globally from Living Planet Database available literature, 44 inhabiting Europe United States literature databases International Union for Conservation Nature NatureServe. We quantified abundance range species. Globally, declined by 88% 1970 2012, with highest declines Indomalaya Palearctic realms (-99% -97%, respectively). Among taxonomic groups, mega-fishes exhibited greatest (-94%). addition, experienced major contractions. For example, ranges 42% all contracted more 40% historical areas. highlight various sources uncertainty tracking distributions lack monitoring spatial biases. detected emphasize critical plight broader need concerted, targeted timely biodiversity.

Language: Английский

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Sand mining in the Mekong Delta: Extent and compounded impacts

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 924, P. 171620 - 171620

Published: March 11, 2024

Sand mining has accelerated in recent years primarily due to population increase and rapid urbanization. To meet demand, the rate of sand extraction often exceeds natural replenishment with serious environmental consequences. In this review paper, Vietnamese Mekong Delta (VMD), a global hotspot for prolonged history intensive riverbed extraction, is used as representative case study highlight extent compounded impacts activity. The budget VMD ranged from 8.5 45.7 Mm3/yr. large difference use different methods determine well difficulties associated measuring volume extracted riverbed. Widespread illegal region further exacerbates mismatch. consequences include deeply incised riverbeds that result riverbank coastal erosion. Massive sediment removal also led river water level reductions, disrupted hydrological connectivity, diminished floodplain inundation. addition, augmented backwater effect results lowering, amplifies saltwater intrusion dry season. While physical studied, studies on ecological socio-economic ramifications remain sparse. ways which upstream dams, irrigation infrastructure, excessive groundwater sea-level rise (SLR) have amplified effects was considered review. This paper concludes by advocating adoption remote sensing-based approaches effective mapping activities need mine sustainably balance developmental needs conservation.

Language: Английский

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Opportunities to curb hydrological alterations via dam re-operation in the Mekong

Nature Sustainability, Journal Year: 2022, Volume and Issue: 5(12), P. 1058 - 1069

Published: Oct. 31, 2022

Language: Английский

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Plastic transport in a complex confluence of the Mekong River in Cambodia

Environmental Research Letters, Journal Year: 2021, Volume and Issue: 16(9), P. 095009 - 095009

Published: Aug. 26, 2021

Abstract Field data on plastic pollution is extremely limited in Southeast Asian rivers. Here we present the first field measurements of transport Mekong, based a comprehensive monitoring campaign during monsoon season confluence Tonle Sap, and Bassac rivers around Cambodia’s capital (Phnom Penh). For improved accuracy estimation loads distribution, combined Neuston net multipoint cross-sectional water sampling with acoustic Doppler current profiler high resolution measurements. During wet season, 2.03 × 10 5 kg d −1 were released from Phnom Penh into equivalent to 89 g capita , or 42% all waste generated city. Most mass moved downstream at surface. A smaller portion plastics mixed deep column, potentially retained rivers, breaking down resuspending over time. Overall, transported by Mekong significant contribution Asia’s release ocean. This represents crucial risk people region, as their livelihoods depend fisheries these bodies.

Language: Английский

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Evaluation of daily gridded meteorological datasets for hydrological modeling in data-sparse basins of the largest lake in Southeast Asia

Journal of Hydrology Regional Studies, Journal Year: 2022, Volume and Issue: 42, P. 101135 - 101135

Published: June 10, 2022

Tonle Sap Lake (TSL) Basin in Cambodia. The development and application of hydrological models for data-sparse basins are hindered by the limited hydro-meteorological data. Although gridded meteorological products alternatively considered many studies, validation with point observations overlooks original spatiotemporal characteristics, thus leading to a selection datasets high uncertainty. Here, we evaluated seven rainfall air temperature covering employing statistical approach based on bilinear-interpolation method using SWAT model, which ensures reliable estimates streamflow evapotranspiration. results indicate that APHRODITE, ERA5, TRMM IMERG-based precipitation CPC SA-OBS-based performed comparably well (R ≥ 0.75) gauged However, ERA5-based relatively poor, while driven APHRODITE underestimated satellite-based evapotranspiration, indicating underestimation basin-wide APHRODITE. IMERG provide more estimation slightly better performance higher spatial resolution dataset suggest is superior modeling impact assessment. These findings showed comparisons gauge-data evaluation not enough justify reliability each dataset.

Language: Английский

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Maintaining perspective of ongoing environmental change in the Mekong floodplains

Current Opinion in Environmental Sustainability, Journal Year: 2019, Volume and Issue: 37, P. 1 - 7

Published: Feb. 27, 2019

Language: Английский

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Freshwater Biodiversity

Published: May 21, 2020

Growing human populations and higher demands for water impose increasing impacts stresses upon freshwater biodiversity. Their combined effects have made these animals more endangered than their terrestrial marine counterparts. Overuse contamination of water, overexploitation overfishing, introduction alien species, alteration natural flow regimes led to a 'great thinning' declines in abundance animals, shrinking' body size with reductions large mixing' whereby the spread introduced species has tended homogenize previously dissimilar communities different parts world. Climate change warming temperatures will alter global availability, exacerbate other threat factors. What conservation action is needed halt or reverse trends, preserve biodiversity rapidly changing world? This book offers tools approaches that can be deployed help conserve

Language: Английский

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Multidecadal variability of the Tonle Sap Lake flood pulse regime

Hydrological Processes, Journal Year: 2021, Volume and Issue: 35(9)

Published: July 30, 2021

Abstract Tonle Sap Lake (TSL) is one of the world's most productive lacustrine ecosystems, driven by Mekong River's seasonal flood pulse. This pulse and its long‐term dynamics under River basin's (MRB) fast socio‐economic development climate change need to be identified understood. However, existing studies fall short sufficient time coverage or concentrate only on changes in water level (WL) that critical parameters influencing ecosystem productivity. Considering rapidly changing hydroclimatic conditions basin, it crucial systematically analyse multiple key parameters. Here, we aim do using observed WL data for 1960–2019 accompanied with several derived from a Digital Bathymetry Model. Results show significant declines inundation area late 1990s dry season whole year, top increased subdecadal variability. Decreasing (increasing) probabilities high (low) 2000–2019 have been found, comparison return period 1986–2000 (1960–1986). The mean cycle daily (wet) 2000–2019, compared 1986–2000, has shifted 10 (5) days. Significant correlations coherence between large‐scale circulations (i.e., El Niño‐Southern Oscillation (ENSO), Pacific Decadal (PDO) Indian Ocean Dipole (IOD)), indicate atmospheric could influenced different scales. Also, discharge at mainstream suggest anthropogenic drivers may impacted levels lake. Overall, our results declining since 1990s.

Language: Английский

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